The Digit Skinnable Clock for Windows XP gives you control over the background image of your desktop clock. This can be a bitmap or Jpeg of any dimension and supports freeform shapes by utilising 'magic pink' transparency.

The display can be changed to any font you have on your system and repositioned on the clock-face using simple controls in the configuration panel (with no need to manually edit the .ini file). You can also set the transparency (alpha-blending) level of the clock (the clock will automatically fade in on mouse over) down to 10%. Many other features can be set in the configuration panel including the 'stay on top' and 'snap to the screen' options.